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If the timing cup has been taken off the end of the camshaft, you need to reinstall that. There is an alignment tab on the end of the cam that positions the cup on the end of the cam as it should be. Use a drop of Loctite #242 (medium blue) on the bolt and torque it to.75-80 INCH pounds.
Now, install the timing plate so that the stand off bolts are near the center of their slots. There is a "V" cut in the plate and there are some slots in the timer cavity in which you use a screwdriver to move the plate. Align the "V" with these slots.
Now, you must set the advanced timing using a strobe light. Remove the plug from the timing hole on the right side of the engine. Connect the timing light to the front cylinder. Start the engine and bring it to a high idle. Shine the light in the hole and adjust the sensor plate until you see the "o" timing mark in the hole. Caution, crankcase pressure will blow an oil mist out of the hole under high pressure. Do not get your eye in front of the hole, stand back and off to the side or purchase a clear timing plug from either a dealer or an aftermarket shop.
Good Luck
Steve

Setting Ignition Timing on your Harley - Nightrider.com

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